If you read closely you may notice that ZFS had relatively little to dowith read performance under heavy write load. ZFS simply has "some fancyI/O scheduling code" that in particular deals with deadlines. The Linuxequivalent appears to be CONFIG_IOSCHED_DEADLINE. But the quotedbenchmark does not mention which scheduler was used for Linux.

So unless the benchmark is redone and properly documented, its numbersare fairly worthless. Bummer.